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A147907 as a simple table

n a(n)
1 1
2 2
3 6
4 16
5 54
6 232
7 936
8 3880
9 23002
10 127008
11 751100
12 4670780
13 29781390
14 193211704
15 1334448490
16 9604883174

[1,2,6,16,54,232,936,3880,23002,127008,751100,
 4670780,29781390,193211704,1334448490,9604883174]

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Last modified January 28 01:15 EST 2022. Contains 350654 sequences. (Running on oeis4.)